234 University of California Publications in Botany [Vol.5 



H 24—22/07 X 30/06. 



143/06 — N. multivalvis {ibid., p. 27). 



H 46—16/07 X 17/07. 



H 47—17/07 X 16/07. 



35/05 — N. quadrivalvis (ibid., p. 27). 



60/07— iV. Bigelovii (ibid., p. 25). 



H 5—22/07 X 68/07. 



H 15—68/07 X 22/07. 



H 7—72/05 X 78/05. 



H 8—78/05 X 72/05. 



The method of conducting the germination tests and the conditions 

 under which they took place were identical with those previously de- 

 scribed (Goodspeed, 1913, p. 202). The great majority of the tests 

 were made under my direction by j\Iiss JNIinnie Yonge during February 

 and March, 1914. The criterion of germination was a trifle different 

 from that of previously reported experiments in that the first appear- 

 ance of the caulicle without the cracked seed coats, rather than the 

 appearance of both caulicle and cotyledons, was taken to constitute 

 germination. Over 10.000 seeds were used. 



The tables that follow (tables I and II) supplement to a certain 

 extent the evidence concerning the relation of the age of tobacco seed 

 and its viability as given in the earlier report {ibid., p. 215). Sixteen 

 species, varieties, and hybrids are added to the list of those tested 

 previously {ibid., p. 210) and repetitions of earlier tests are shown in 

 two cases. 



